The open plant encyclopedia
Snap a photo or search by any name to see how to care for it, where it comes from, whether it's safe, and a 3D model you can turn.
The plants people record most in your country, and ones that grow there wild.
Filter by what you want to do, shape, origin, country, care and safety.
Helianthus schweinitzii
Helianthus schweinitzii, commonly known as Schweinitz's sunflower, is a rare, federally endangered perennial wildflower native to the Piedmont physiographic province of North Carolina and South Carolina. It is a member of the sunflower family (Asteraceae). Typically growing between 1 and 2 meters (3 to 7 feet) tall, the plant is distinguished by its yellow ray flowers, narrow leaves, and unique ecological and genetic traits. It is primarily found in specialized open habitats such as prairies, roadsides, and utility and highway rights-of-way in the Carolinas. It is one of the rarest species of sunflower in the United States, with only about 90 known populations, many containing fewer than 40 plants each. The U.S. Fish and Wildlife Service listed Schweinitz's sunflower as an endangered species on May 7, 1991.
Although Helianthus schweinitzii is primarily managed as a rare, federally endangered species rather than a commercial crop, wild sunflower species in the genus Helianthus are valuable for botanical research and agricultural development. Through decades of botanical exploration and germplasm collection, researchers have examined wild sunflower species to identify adaptive traits such as drought tolerance, disease resistance, and environmental resilience. Conserving wild species such as H. schweinitzii therefore helps preserve genetic resources and may provide valuable insights for improving and breeding cultivated sunflower varieties. In specialized native landscaping or conservation garden settings, cultivation requires conditions that mimic its natural Piedmont Prairie habitat, including well-suited soils and full sunlight. However, direct cultivation remains limited due to the species’ protected conservation status.
While Helianthus schweinitzi is frequently documented surviving along managed utility rights-of-way, power lines, and roadsides, field studies of existing Piedmont Prairie sites within North and South Carolina have revealed more about the species' historical ecological conditions. Research on these specialized habitats highlights the species' dependence on specific environmental elements, such as shallow, poor, clay, and/or rocky soils and other microenvironmental conditions specifically found throughout the southern Piedmont region, emphasizing the importance of conserving rare prairie remnants to protect its natural habitat. Additionally, the flower flourishes in full to partial sun exposure. As of 2003, approximately 80% of known populations were located near railways, utility roads, and roadsides. Today, 94 known populations exist in North and South Carolina, which is a significant increase from the 13 marked in the 1990s.
Southeastern sunflower · Helianthus ambiguus · Swamp sunflower · Common sunflower · Western sunflower · Silverleaf sunflower · Arizona sunflower · Purpledisk sunflower · Serpentine sunflower · Helianthus brevifolius · California sunflower · Lakeside sunflower
Text excerpted from the Wikipedia article Helianthus schweinitzii by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
